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slices

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This commit is contained in:
bronku 2025-11-28 17:14:40 +01:00
parent 2c72168e18
commit d294daa307
12 changed files with 104 additions and 41 deletions
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48
src/ast/expressions.hpp
View file

@ -100,6 +100,54 @@ struct Subscript : Expr
}
};
struct Slice : Node
{
ptr<Expr> lower;
ptr<Expr> upper;
ptr<Expr> step;
Slice(ptr<Expr> l, ptr<Expr> u, ptr<Expr> s) : upper(std::move(u)), lower(std::move(l)), step(std::move(s)) {}
std::string dump(int indent = 0) const override
{
std::ostringstream oss;
oss << indent_str(indent) << "Slice";
if (lower)
{
oss << "\n"
<< indent_str(indent + 1) << "Lower\n";
oss << lower->dump(indent + 2);
}
if (upper)
{
oss << "\n"
<< indent_str(indent + 1) << "Upper\n";
oss << upper->dump(indent + 2);
}
if (step)
{
oss << "\n"
<< indent_str(indent + 1) << "Step\n";
oss << step->dump(indent + 2);
}
return oss.str();
}
};
struct SliceSubscript : Expr
{
ptr<Expr> value;
ptr<Slice> index;
SliceSubscript(ptr<Expr> v, ptr<Slice> i)
: value(std::move(v)), index(std::move(i)) {}
std::string dump(int indent = 0) const override
{
std::ostringstream oss;
oss << indent_str(indent) << "SliceSubscript\n";
oss << value->dump(indent + 1) << '\n';
oss << index->dump(indent + 1);
return oss.str();
}
};
struct List : Expr
{
std::vector<ptr<Expr>> elements;

45
src/parser.y
View file

@ -53,6 +53,8 @@
%right BIT_AND_ASSIGN BIT_OR_ASSIGN BIT_XOR_ASSIGN LSHIFT_ASSIGN RSHIFT_ASSIGN
%type <std::unique_ptr<Expr>> expr
%type <std::unique_ptr<Expr>> opt_expr
%type <std::unique_ptr<Slice>> slice
%type <std::unique_ptr<Stmt>> stmt
%type <std::vector<std::unique_ptr<Expr>>> args
%type <std::vector<std::unique_ptr<Stmt>>> stmt_list
@ -70,12 +72,16 @@ stmt_list:
;
stmt:
expr NEWLINE { $$ = std::make_unique<ExprStmt>(std::move($1)); }
| expr ASSIGN expr NEWLINE { $$ = std::make_unique<Assign>(std::move($1), std::move($3));}
expr NEWLINE {
$$ = std::make_unique<ExprStmt>(std::move($1));
}
| expr ASSIGN expr NEWLINE {
$$ = std::make_unique<Assign>(std::move($1), std::move($3));
}
| KW_IF expr COLON NEWLINE INDENT stmt_list DEDENT {
$$ = std::make_unique<If>(std::move($2), std::move($6), std::vector<std::unique_ptr<Stmt>>());
}
| KW_IF expr COLON NEWLINE INDENT stmt_list DEDENT KW_ELSE COLON NEWLINE INDENT stmt_list DEDENT{
| KW_IF expr COLON NEWLINE INDENT stmt_list DEDENT KW_ELSE COLON NEWLINE INDENT stmt_list DEDENT {
$$ = std::make_unique<If>(std::move($2), std::move($6), std::move($12));
}
| KW_FOR IDENTIFIER KW_IN expr COLON NEWLINE INDENT stmt_list DEDENT {
@ -84,25 +90,40 @@ stmt:
| KW_DEF IDENTIFIER L_PAREN params R_PAREN COLON NEWLINE INDENT stmt_list DEDENT {
$$ = std::make_unique<FunctionDef>($2, std::move($4), std::move($9));
}
| KW_RETURN expr NEWLINE { $$ = std::make_unique<Return>(std::move($2));}
| KW_RETURN expr NEWLINE {
$$ = std::make_unique<Return>(std::move($2));
}
;
expr:
NUMBER { $$ = std::make_unique<Number>($1); }
| IDENTIFIER { $$ = std::make_unique<Identifier>($1); }
| STRING { $$ = std::make_unique<String>($1); }
| expr PLUS expr { $$ = std::make_unique<BinOp>(
BinaryOperator(BinaryOperator::ADD),
std::move($1), std::move($3)); }
| expr MULTIPLY expr { $$ = std::make_unique<BinOp>(
BinaryOperator(BinaryOperator::MUL),
std::move($1), std::move($3)); }
| L_PAREN expr R_PAREN {$$ = std::move($2); /* #todo: test for precedence*/}
| expr PLUS expr { $$ = std::make_unique<BinOp>( BinaryOperator(BinaryOperator::ADD), std::move($1), std::move($3)); }
| expr MULTIPLY expr { $$ = std::make_unique<BinOp>( BinaryOperator(BinaryOperator::MUL), std::move($1), std::move($3)); }
| expr LT expr { $$ = std::make_unique<BinOp>( BinaryOperator(BinaryOperator::LT) , std::move($1), std::move($3)); }
| expr KW_AND expr { $$ = std::make_unique<BinOp>( BinaryOperator(BinaryOperator::AND) , std::move($1), std::move($3)); }
| expr KW_OR expr { $$ = std::make_unique<BinOp>( BinaryOperator(BinaryOperator::OR) , std::move($1), std::move($3)); }
| expr L_BRACKET expr R_BRACKET { $$ = std::make_unique<Subscript>(std::move($1), std::move($3));}
| expr L_BRACKET slice R_BRACKET{ $$ = std::make_unique<SliceSubscript>(std::move($1), std::move($3)); }
| L_PAREN expr R_PAREN {$$ = std::move($2); }
| expr L_PAREN args R_PAREN { $$ = std::make_unique<Call>(std::move($1), std::move($3));}
| expr DOT IDENTIFIER { $$ = std::make_unique<Attribute>(std::move($1), $3);}
| L_BRACKET args R_BRACKET { $$ = std::make_unique<List>(std::move($2));}
| MINUS expr { $$ = std::make_unique<UnaryOpExpr>(UnaryOperator(UnaryOperator::NEG), std::move($2));}
;
slice:
opt_expr COLON opt_expr
{ $$ = std::make_unique<Slice>(std::move($1), std::move($3), nullptr); }
| opt_expr COLON opt_expr COLON opt_expr
{ $$ = std::make_unique<Slice>(std::move($1), std::move($3), std::move($5)); }
;
opt_expr:
{ $$ = nullptr;}
| expr { $$ = std::move($1);}
args:
/* empty */ { $$ = std::vector<std::unique_ptr<Expr>>(); }
| expr { $$ = std::vector<std::unique_ptr<Expr>>();
@ -120,4 +141,4 @@ namespace yy {
{
std::cerr << "Error: " << msg << "\n";
}
}
}

10
src/scanner.hpp
View file

@ -24,13 +24,13 @@ public:
if (eof_emitted)
{
//std::cout << "lex: 0\n";
// std::cout << "lex: 0\n";
return 0;
}
if (indent_stack.popDedent())
{
//std::cout << "lex: dedent\n";
// std::cout << "lex: dedent\n";
return yy::parser::token::TOK_DEDENT;
}
@ -43,14 +43,14 @@ public:
if (!last_was_newline)
{
last_was_newline = true;
//std::cout << "lex: newline\n";
// std::cout << "lex: newline\n";
return yy::parser::token::TOK_NEWLINE;
}
auto result = indent_stack.closeBlock();
if (result == IndentAction::Dedent)
{
//std::cout << "lex: dedent\n";
// std::cout << "lex: dedent\n";
return yy::parser::token::TOK_DEDENT;
}
@ -59,7 +59,7 @@ public:
last_was_newline = (token == yy::parser::token::TOK_NEWLINE);
//std::cout << "lex: " << Parser::symbol_name(static_cast<kind>(token)) << '\n';
// std::cout << "lex: " << Parser::symbol_name(static_cast<kind>(token)) << '\n';
return token;
}